Let me sums up your comments to defend Warlock and hunter and bash Titans:
Warlock can self-res! (So basicallly, they keep their supers all day long for the ''if i die and everybody is dead I'll save the day moment (not in HM since you can't res others anyway) Result --> pretty selfish)
Hunter can go invis ( So basically they bait their team by going invis all day long just for them to stay alive) Result ---> Even more selfish, baiters are dumb. Fight like a men.
Titans make things easier but are not needed (implying other class are essential, which is laughable).
Hunters in PVE are by far the most useless class of all. The only time ever in all the game where they shine just a little is in Crota HM, and it ''only make things easier but are not needed'' at all. Everywhere else in the game, EVERYWHERE, i would replace a hunter by a titan or warlock any day. No need for baiters. Their supers are so underpowered against higher lvl enemy its just useless to even use them.
Warlock is fine if it uses its supers TO PRODUCE orbs and not just as a self-res oh-shit-I-made-a-dumb-move-I'm-gonna-save-my-ass option.
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My favorite class is the Warlock, although I've been using my Hunter because I like grabbing the Sword (No need to use a Heavy Ammo synthesis or do the Glitch) plus I'm good with the Sword. But as for my Warlock, throughout the Crota fight, I use Voidwalker for both Health and using my Super on the two knights in the beginning for Orbs (which I can't use myself, so I don't really care about using my Super and helping my team out). Yet I feel more confident and play better if I have my self-res, because I know I have a second life, and since I don't die a lot (I don't even use my super in Nightfall, ever) I can just get up close and kill enemies without being worried that I'll die).